7 Sep
2010
7 Sep
'10
9:29 a.m.
I think I have the NEC databook containing the series. Do you need a scan?
Thanks,
Maurice
On Mon, Sep 6, 2010 at 5:13 PM, allison <ajp166 at verizon.net> wrote:
On 09/06/2010 02:34 PM, Brent Hilpert wrote:
--
I've clicked for peace! Have you?
www.tenmillionclicksforpeace.org/?sid=80760c414LJa5893tG4095162&s=1
On 2010 Sep 6, at 5:56 AM, allison wrote:
Many of the 4bit MCUs did that. ?The instruction set is is similar to 8080
and different since it has
skip on condition and typical Harvard oddities and additions for tables and
inline constants.
The family closest to it is the 1980s ucom75.
Allison
On 09/05/2010 10:06 PM, Brent Hilpert wrote:
>
> I just ran across an NEC D75008 microcontroller in a small photo copier
> ca. 1990. According to a search it is a 4-bit microcontroller.
>
> Idle curiousity, but does anybody know if this has any inheritance from
> or relation to better-known microcontrollers such as the TMS1000, that is,
> is it NEC's version of something better known?, or is it NEC's own
> architecture?
No, ?it is NEC unique. ?For 4 bitters that is
usually the case. ? it is a
much more expanded
design closer to modern PICs with many variants having LCD driver on
board.
OK, a family I had never run across before. Found a datasheet for (by
appearance) a descendant (D75112/6). Looks like they took a cue from the
8080 family - the register set is nearly identical but in 4 bits, with
register pairs BC, DE, HL to make 8-bit registers.